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/*
* Copyright (C) 2019 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.server.wallpaper;
import static android.opengl.EGL14.EGL_ALPHA_SIZE;
import static android.opengl.EGL14.EGL_BLUE_SIZE;
import static android.opengl.EGL14.EGL_CONFIG_CAVEAT;
import static android.opengl.EGL14.EGL_CONTEXT_CLIENT_VERSION;
import static android.opengl.EGL14.EGL_DEFAULT_DISPLAY;
import static android.opengl.EGL14.EGL_DEPTH_SIZE;
import static android.opengl.EGL14.EGL_GREEN_SIZE;
import static android.opengl.EGL14.EGL_HEIGHT;
import static android.opengl.EGL14.EGL_NONE;
import static android.opengl.EGL14.EGL_NO_CONTEXT;
import static android.opengl.EGL14.EGL_NO_DISPLAY;
import static android.opengl.EGL14.EGL_NO_SURFACE;
import static android.opengl.EGL14.EGL_OPENGL_ES2_BIT;
import static android.opengl.EGL14.EGL_RED_SIZE;
import static android.opengl.EGL14.EGL_RENDERABLE_TYPE;
import static android.opengl.EGL14.EGL_STENCIL_SIZE;
import static android.opengl.EGL14.EGL_WIDTH;
import static android.opengl.EGL14.eglChooseConfig;
import static android.opengl.EGL14.eglCreateContext;
import static android.opengl.EGL14.eglCreatePbufferSurface;
import static android.opengl.EGL14.eglDestroyContext;
import static android.opengl.EGL14.eglDestroySurface;
import static android.opengl.EGL14.eglGetDisplay;
import static android.opengl.EGL14.eglGetError;
import static android.opengl.EGL14.eglInitialize;
import static android.opengl.EGL14.eglMakeCurrent;
import static android.opengl.EGL14.eglTerminate;
import static android.opengl.GLES20.GL_MAX_TEXTURE_SIZE;
import static android.opengl.GLES20.glGetIntegerv;
import android.opengl.EGLConfig;
import android.opengl.EGLContext;
import android.opengl.EGLDisplay;
import android.opengl.EGLSurface;
import android.opengl.GLUtils;
import android.os.SystemProperties;
import android.util.Log;
class GLHelper {
private static final String TAG = GLHelper.class.getSimpleName();
private static final int sMaxTextureSize;
static {
int maxTextureSize = SystemProperties.getInt("sys.max_texture_size", 0);
sMaxTextureSize = maxTextureSize > 0 ? maxTextureSize : retrieveTextureSizeFromGL();
}
private static int retrieveTextureSizeFromGL() {
try {
String err;
// Before we can retrieve info from GL,
// we have to create EGLContext, EGLConfig and EGLDisplay first.
// We will fail at querying info from GL once one of above failed.
// When this happens, we will use defValue instead.
EGLDisplay eglDisplay = eglGetDisplay(EGL_DEFAULT_DISPLAY);
if (eglDisplay == null || eglDisplay == EGL_NO_DISPLAY) {
err = "eglGetDisplay failed: " + GLUtils.getEGLErrorString(eglGetError());
throw new RuntimeException(err);
}
if (!eglInitialize(eglDisplay, null, 0 /* majorOffset */, null, 1 /* minorOffset */)) {
err = "eglInitialize failed: " + GLUtils.getEGLErrorString(eglGetError());
throw new RuntimeException(err);
}
EGLConfig eglConfig = null;
int[] configsCount = new int[1];
EGLConfig[] configs = new EGLConfig[1];
int[] configSpec = new int[] {
EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
EGL_RED_SIZE, 8,
EGL_GREEN_SIZE, 8,
EGL_BLUE_SIZE, 8,
EGL_ALPHA_SIZE, 0,
EGL_DEPTH_SIZE, 0,
EGL_STENCIL_SIZE, 0,
EGL_CONFIG_CAVEAT, EGL_NONE,
EGL_NONE
};
if (!eglChooseConfig(eglDisplay, configSpec, 0 /* attrib_listOffset */,
configs, 0 /* configOffset */, 1 /* config_size */,
configsCount, 0 /* num_configOffset */)) {
err = "eglChooseConfig failed: " + GLUtils.getEGLErrorString(eglGetError());
throw new RuntimeException(err);
} else if (configsCount[0] > 0) {
eglConfig = configs[0];
}
if (eglConfig == null) {
throw new RuntimeException("eglConfig not initialized!");
}
int[] attr_list = new int[] {EGL_CONTEXT_CLIENT_VERSION, 2, EGL_NONE};
EGLContext eglContext = eglCreateContext(
eglDisplay, eglConfig, EGL_NO_CONTEXT, attr_list, 0 /* offset */);
if (eglContext == null || eglContext == EGL_NO_CONTEXT) {
err = "eglCreateContext failed: " + GLUtils.getEGLErrorString(eglGetError());
throw new RuntimeException(err);
}
// We create a push buffer temporarily for querying info from GL.
int[] attrs = {EGL_WIDTH, 1, EGL_HEIGHT, 1, EGL_NONE};
EGLSurface eglSurface =
eglCreatePbufferSurface(eglDisplay, eglConfig, attrs, 0 /* offset */);
eglMakeCurrent(eglDisplay, eglSurface, eglSurface, eglContext);
// Now, we are ready to query the info from GL.
int[] maxSize = new int[1];
glGetIntegerv(GL_MAX_TEXTURE_SIZE, maxSize, 0 /* offset */);
// We have got the info we want, release all egl resources.
eglMakeCurrent(eglDisplay, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
eglDestroySurface(eglDisplay, eglSurface);
eglDestroyContext(eglDisplay, eglContext);
eglTerminate(eglDisplay);
return maxSize[0];
} catch (RuntimeException e) {
Log.w(TAG, "Retrieve from GL failed", e);
return Integer.MAX_VALUE;
}
}
static int getMaxTextureSize() {
return sMaxTextureSize;
}
}
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